2018 · Q81
If the diagonal of a cube is of length I, then the total surface area of the cube is
Elementary MathematicsMensuration
- A3l23l^2
- B3l2√{3}l^2
- C2l2√{2}l^2
- D2l22l^2
Explanation
If the side is a, the diagonal is a sqrt(3) = l, so a = l/sqrt(3). The total surface area is 6a^2 = 6l^2/3 = 2l^2. Hence option D.